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一、井筒过厚表土及含水层的施工九龙口矿主、副井筒表土层施工,采用井外降水及锚、网、喷混凝土临时支护,顺利通过130米表土及含水层,取得了较好的技术经济效果。主井平均月进31米,副井预计平均月进35米(截至6月30日表土尚有13米)。与原设计方案(主井采用沉井法、副井采用冻结法施工)比较,主井工期缩短八个月,副井工期预计缩短六个月,两井合计节约227万元。
First, the wellbore is too thick topsoil and aquifer construction Jiulongkou mine main and auxiliary shaft topsoil construction, the use of extra-well dewatering and anchor, net, spray concrete temporary support, through 130 meters of surface soil and aquifer, and achieved better The technical and economic results. The average length of the main shaft is 31 meters. The average auxiliary shaft is expected to be 35 meters per month (13 meters as of June 30). Compared with the original design scheme (the main shaft adopts the caisson method and the auxiliary shaft is constructed by freezing method), the main shaft period is shortened by eight months, the auxiliary shaft construction period is expected to be shortened by six months, and the two wells together save an estimated 2.27 million yuan.